Facing the largest anti-government protests in his 11 months in power, Venezuelan President Nicolas Maduro appears ready to move forward with the prosecution of a leading opposition figure on charges of terrorism and murder.

Four anti-government protesters and one government supporter have died in clashes around the country.

The man the government blames for the deaths is opposition leader Leopoldo Lopez, who turned himself in to authorities on Tuesday.

Human rights groups warn about the danger of turning the protests into a persecution of political opponents.

The charges against Lopez, who has organized protests demanding better security, an end to shortages and protected freedom of speech, “smack of a politically motivated attempt to silence dissent in the country,” Amnesty International said in a statement.